Did you purchase TurboTax Business or TurboTax Home and Business? There is a big difference.
Is this what you purchased?
If you purchased TT Business there should not be a problem with installing it to the same computer on which you put Premier. But TT Home and Business cannot be on the same computer as Premier. Both of those are desktop software for preparing individual income tax returns.
To call TurboTax customer support
They are available from 5 a.m. to 5 p.m. Pacific time Monday-Friday